How to achieve this destruction effect?
For this purpose blender user usually use Rigid Body simulation. Here is a cookbook for a cube segmented into 10x10x10 (1000 parts). Yes it is process intensive and this is just one cube. The most calculation takes Constraints.

Create a Cube

Select a Cube
Assign Array Modifier &gt; Count=10 &gt; X=1
Assign Array Modifier &gt; Count=10 &gt; Y=1
Assign Array Modifier &gt; Count=10 &gt; Z=1

Search for operators:

Convert to Mesh
Separate by Loose Parts
Origin to Geometry
Move to Collection &gt; New

Create a floor
Add a Plane and search for operators

Transform Scale
Apply Scale

Create a simulation
With Cubes selected, search for operators:

Active (Rigid Body)
Change collision shape &gt; Box
Connect (Rigid Body)

With Plane selected, search for operators:

Passive (Rigid Body)
Change collision shape &gt; Box




You can also try version of Blender with Fracture Modifier, that is much comfortable to work with, especially with constraints, but I didnt find grid cuts.